In order to ensure the safety of the ship and its equipment during UMS operation, certain essential functions （）.<br>A:must be provided<br>B:may be provided<br>C:have provided<br>D:can be provided

In order to ensure the safety of the ship and its equipment during UMS operation, certain essential functions （）.
A:must be provided
B:may be provided
C:have provided
D:can be provided

出自：海船船员证

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